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    It is shown by approximate but reliable DFT calculations that the title compounds represent very strong superbases in gas phase and MeCN. In particular, tris-(hexamethyltriaminophosphazenyl)phosphine has a proton affinity, PA, of 295.5 kcal mol−1 and records a pKa(MeCN) of 50 ± 1 units.
    Proton affinity
    Citations (60)
    (2020). Diiron propane-1,2-dithiolate complexes with monosubstituted tris(3-chlorophenyl)phosphine or tris(4-trifluoromethylphenyl)phosphine: synthesis, characterization, crystal structures, and electrochemistry. Inorganic and Nano-Metal Chemistry: Vol. 50, No. 11, pp. 1137-1143.
    Propane
    Single crystals of the low-melting title compound, tris(n-propyl)phosphine, C9H21P, (1), and its isomer, tris(isopropyl)phosphine, (2), were grown in situ in capillaries. The crystal and molecular structures of both compounds were determined at 102 K. Compound (1) has an approximate mirror plane and C—P—C angles between 99.8 (1) and 102.3 (1)°, whereas compound (2) displays no molecular symmetry and C—P—C angles ranging from 102.0 (1) to 104.7 (1)°.
    Isopropyl
    Citations (8)